工程机械用发动机动力性能评价指标

Evaluation criterion of engine power properties for construction machinery

为了合理评价工程机械用发动机(柴油机)的动力性能,对现行评价指标扭矩适应性系数KM、速度适应性系数KV、发动机功率Pe、比油耗ge等进行了分析,指出现行评价指标在作为评价发动机动力性能的量化指标时,特别是在比较不同发动机的动力性能时,忽略了发动机在工作转速范围内(额定转速neH到最大扭矩转速nem)的差异性,因而不能全面反映发动机的动力性能的动态过程,并提出了平均功率PeP、平均扭矩MeP和平均比油耗geP等新指标。研究结果表明:新指标对现行评价指标进行了补充和完善,为准确全面地评价发动机的动力性能及其选型提供了理论依据。

In order to evaluate the engine＇s power properties, the characteristic factor of torque- load KM, the accommodation factor of speed Kv, the engine power Pe and the fuel consumption ge for construction machinery were analyzed. It was found that engine＇s power properties were decided mainly by engine＇s external characteristics curve and the difference of engines in working speed range （the rated speed nell to the biggest torque speed nora）was ignored. When they were specially used in comparing the power properties among different engines, the current evaluation index couldn＇t comprehensively reflect engine＇s power properties. In addition, the average power （Pop）, the average torque （Mop） and the average fuel consumption （goe） were suggested. The re- suits show that these new factors supplement the current evaluation criterion and provide theoret- ic reference for the comprehensive evaluation of engine＇s power properties. 4 figs, 11 refs.